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esp_dma_split_rx_buffer_to_cache_aligned() function
Split DMA RX buffer to cache aligned buffers brief sketch: cache alignment delimiter cache alignment delimiter │ │ Origin Buffer │ Origin Buffer │ │ │ │ │ │ ▼ ▼ ▼ │ ...---xxxxx|xxxxxxxxxxxxxxxxxxxxxxxxxxxxx|xxxxx----... │ │ │ │ │ │ ▼ │ │ │ |xxxxxxxxxxxxxxxxxxxxxxxxxxxxx| │ │ │ ▲ │ ▼ │ │ │ Aligned buffers └──► Head Body Tail ◄──────┘ │ │ ▼ ▼ |xxxxx......| |xxxxx......|
Syntax
esp_err_t esp_dma_split_rx_buffer_to_cache_aligned(void *rx_buffer,
size_t buffer_len,
dma_buffer_split_array_t *align_buf_array,
uint8_t** ret_stash_buffer);
Implemented in ![]()
esp_dma_utils.c:28
Return value
- ESP_OK: Split to aligned buffer successfully - ESP_ERR_INVALID_ARG: Split to aligned buffer failed because of invalid argument
Notes
After the original RX buffer is split into an array, caller should mount the buffer array to the DMA controller in scatter-gather mode. Don't read/write the aligned buffers before the DMA finished using them.